I am both a Dynaudio and Totem fan, but I would not look fist to either Dynaudio or Totem for use with a 15W tube amp, but having said that, integrate a good powered subwoofer and offload most of the low end work to that and you might get by if you do not have to go too loud.
I did this running Dyn Contour 1.3 mkII monitors off my vintage 20 W Yamaha SS receiver, in a typical sized family room and the results were actually quite good and much better than I expected. Same true with my Triangle Titus monitors, which are also inherently more efficient and tube friendly than Dynaudio.
Otherwise, Zu seems to have all kinds of things going on with their high efficiency speaker line these days. Maybe their monitors are a good fit.
MErlin VSM monitors are another popular option that seem to thrive on tube amps.
I did this running Dyn Contour 1.3 mkII monitors off my vintage 20 W Yamaha SS receiver, in a typical sized family room and the results were actually quite good and much better than I expected. Same true with my Triangle Titus monitors, which are also inherently more efficient and tube friendly than Dynaudio.
Otherwise, Zu seems to have all kinds of things going on with their high efficiency speaker line these days. Maybe their monitors are a good fit.
MErlin VSM monitors are another popular option that seem to thrive on tube amps.